My current favorite is valvoline 5w30 full synthetic. There are oil analysis of new that show it has a high 100 C viscosity and it has a ton of really good additives.
any oil that meets the LL-01 standard will do, buy whatever is on sale. Castrol Edge Euro 5w30 is fine, Mobil 1 euro synthetic, whatever.
My conclusion was to use the best Castrol in the gold bottle. Of course, YOU must use the specification of weight recommended by the owners manual for the temperature range you expect to be operating in.
The gallon of Castrol is the same whether you buy it at CT or Napa.
Personally I always run Castrol and it's done me well, even in older cars that had been a bit battered.
Been using the molygen one, noticed a small reduction of oil consumption and better idling than Castrol (VW recommended)
I use the blue bottle 5w-40 on my 2.5 Mk5 Rabbit.
Runs quieter than when i used Castrol High Mileage.
About $22 for 5 Qts. of Castrol (you can buy it on Amazon or at Walmart for a decent price). Filter is about $4.00 or more if you buy a premium filter.
I personally run the valvoline, seems to be a tad quieter on the valvetrain.
I was using the OEM Castrol 5w40 and recently switched to Castrol European Formula 0w40. I found that I had the oil level drop a bit (oil burn perhaps) with the latter. For the current change I went back to OE Castrol and will see if things go back to no level drop.
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